The chemical abundance of a main-sequence star usually reflects how much nuclear burning has gone on inside it.
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Q8: Globular clusters have much higher stellar densities
Q9: The Milky Way is like most other
Q10: The locations of globular clusters on the
Q11: Our galaxy is a typical barred spiral
Q12: Open clusters are only found in the
Q14: There are many more individual stars residing
Q15: The youngest disk stars are found in
Q16: Stars in the Milky Way that are
Q17: There are no known processes that can
Q18: Cosmic rays come mostly from extragalactic sources
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